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Share-Based Compensation - Schedule of Share-based Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	$ 16	$ 19	$ 9
Unrecognized Expense	27
Incentive Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	4	7	2
Unrecognized Expense	$ 15
Weighted Average Remaining Years	1 year 8 months 12 days
Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	$ 8	8	3
Unrecognized Expense	$ 4
Weighted Average Remaining Years	1 year 7 months 6 days
Performance awards | CEO Performance Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	$ 2	0	0
Unrecognized Expense	$ 8
Weighted Average Remaining Years	3 years
Performance awards | 2018 CEO Performance Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	$ 2	0	0
Unrecognized Expense	$ 0
Weighted Average Remaining Years	0 years
Performance awards | Former CEO Performance Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	$ 0	$ 4	$ 4
Unrecognized Expense	$ 0
Weighted Average Remaining Years	0 years

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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-Publisher FASB
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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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